found: OED online, Feb. 10, 2012:(Ni-Vanuatu: plural: Ni-Vanuatu; a native, inhabitant, or citizen of Vanuatu)
found: Britannica online, Feb. 10, 2012:Vanuatu (The indigenous population, called ni-Vanuatu, is overwhelmingly Melanesian, though some of the outlying islands have Polynesian populations)
found: Countries and their cultures WWW site, Feb. 10, 2012:(Ni-Vanuatu: The Ni-Vanuatu are the Melanesian people that make up the population of the Republic of Vanuatu)
found: National geographic style manual online, Feb. 10, 2012:(Vanuatuan: NGS accepts this spelling for a resident of Vanuatu, especially in passing reference when the use of ni-Vanuatu (the term used by the people of Vanuatu) might be confusing)